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Patents Future Amortization Expense for Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Finite-Lived Intangible Assets [Line Items]  
For the remainder of 2013 $ 39,191us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2014 49,584us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2015 48,496us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2016 44,368us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2017 38,738us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 54,282us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total expected amortization expense $ 274,659us-gaap_FiniteLivedIntangibleAssetsNet